You can renew your IL drivers license or buy plated at the Secretary of State kiosk by the classic and custom cars. I renewed my license with NO WAITING! ON A SATURDAY!
Come early. It was open for only an hour when I arrived and there was room to sprint. An hour later, I could hardly power walk to get where I needed to go.
Kinda disappointed. Seems the show was bigger and grander back in the 90s. Still decent but many of the same things will appear at my local show in Denver.